- Machinery, Supplies & Equipment - Business Supplies Related, Norwich
- Machinery, Supplies & Equipment - Construction & Contractor Related, Norwich
- Manufacturing, Norwich
- Manufacturing Products, Norwich
- Masonry Materials & Supplies, Norwich
- Massage Therapists & Professional, Norwich
- Massage Therapy, Norwich
- Meat Market, Wholesale & Products, Norwich
- Meat Packers, Norwich
- Medical Supplies & Equipment, Norwich
- Membership Sports & Recreation Clubs, Norwich
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- Metal Repair Service & Blacksmith, Norwich - Iron Works
- Miscellaneous Agriculture, Norwich
- Miscellaneous Government, Norwich
- Miscellaneous Personal Services, Norwich
- Mortgage Bankers & Correspondents, Norwich
- Mortgage Brokers, Norwich
- Motor Vehicle, Norwich
- Motor Vehicle Rental & Leasing, Norwich
- Motorcycle Parts, Accessories & Dealers, Norwich
- Moving Truck Rental , Norwich
- Museums, Norwich
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